[FOTZeiss] Fw: Lunar eclipse over the Acropolis: June 15

[Glenn A. Walsh]

FYI

gaw

Glenn A. Walsh, Project Director,
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--- On Sat, 6/25/11, LARRY KLAES <ljk4 at MSN.COM> wrote:

> From: LARRY KLAES <ljk4 at MSN.COM>
> Subject: Lunar eclipse over the Acropolis
> To: HASTRO-L at listserv.wvu.edu
> Date: Saturday, June 25, 2011, 11:39 AM

> http://apod.nasa.gov/apod/ap110625.html

Eclipse over
> the Acropolis 
> Image Credit & Copyright: 
> Elias Politis 
> Explanation: The total phase of the June 15 
> lunar eclipse lasted an impressive 100 minutes. Its entire
> duration is 
> covered in this composite of a regular sequence of digital
> camera exposures, 
> tracking the dark lunar disk as it arced above the 
> Acropolis in Athens, Greece. In fact, around 
> 270 BCE Greek astronomer Aristarchus 
> also tracked the duration of lunar eclipses, though without
> the benefit of digital 
> clocks and cameras. Still, using geometry, he devised 
> a simple and impressively accurate way to calculate the
> Moon's distance, in 
> terms of the radius of planet Earth, from the eclipse
> duration. A more modern 
> Greek astronomer, Elias Politis titled this eclipse
> duration study and the 
> accompanying youtube timelapse video "Acropoclipse". 
>      
>         
>           
>